angularjs - nodejs: calculate distance from location to user -


this question exact duplicate of:

i'm building api stores locations (with coordinates), , want query them based on distance user.

in view controller, have code:

var geolocation = angular.module('geolocation', []);                 navigator.geolocation.watchposition(render);         var lat, lon = 0;         function render(pos) {             lat = pos.coords.latitude;             lon = pos.coords.longitude;             console.log(lat +","+ lon);         }

that returns user current position. schema modeled this:

var locationschema = new schema({   locationname: {     type: string,     required: 'enter name of location.'   },   description: {     type: string,     required: 'enter description of location.'   }, geolocation: {      type: { type: string, default:"point" },      coordinates: [number],    },

and in apicontroller, tried this:

  exports.find_all_locations_near = function(req, res) {   location.find({     geolocation:       {          $near :         {             $geometry: { type: "point",  coordinates: [ lat, lon ] },             $mindistance: req.body.mindistance,             $maxdistance: req.body.maxdistance         }       }   }), function(err, location) {     if (err)       res.send(err);     else if (location =='')       //res.json({ message: 'no location found.' });       console.log('no location found.');     else       res.json(location);       }; }

i'm submitting min , max distances way:

<div class="form-group">                                                 <label>min distance</label> <input type="text" class="form-control text-center" ng-model="formdata.mindistance"><br>                     </div>                     <div class="form-group">                                                 <label>max distance</label> <input type="text" class="form-control text-center" ng-model="formdata.maxdistance"><br>                     </div>

but nothing happens. 0 results. doing wrong? also, how can calculate distance between user , location , return on each row?

please note while storing coordinates, longitude should come first , latitude. if looks confusing, you store coordinates embedded document keys lng & lat.

querying geojson data


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